Ridged waveguide wide band diplexer with extremely sharp cut-off

Details Ridged waveguide wide band diplexer with extremely sharp cut-off Ridged waveguide wide band diplexer with extremely sharp cut-off

1988-01-20

1989-03-14

Nussbaum, Marvin L.

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333159, 333208, 333209, 333248, 370 30, H01P 1213, H01P 1209, H01P 1207, H01P 118

Patent

active

048127892

ABSTRACT:
A wideband balanced diplexer splits an incoming wideband microwave frequency signal into separate upper and lower frequency outputs and possesses a sharp band cut-off to increase effective bandwidth. The diplexer includes a pair of waveguide assemblies for separating the upper frequency band from the incoming signal. Each waveguide assembly includes a tuneable, ridged waveguide phase shifter for shifting the phase of the lower frequency band, a reference waveguide for inserting a delay onto the upper frequency signal in order to compensate for the effects of the phase shifter in the other waveguide assembly, and a high pass filter. The high pass filter includes a ridged waveguide having tapered ends of a shape comprising an exponential function raised to a cosine squared power to increase the bandwidth of the upper frequencies and to provide a sharper frequency cut-off.

REFERENCES:
patent: 3235821 (1966-02-01), Wilkinson
patent: 4060778 (1977-11-01), Hefni et al.

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